FR2727367A1 - WINDSCREEN WINDOW FOR A GLASS HAVING A CONSTANT CURVATURE RADIUS - Google Patents

Abstract

The invention relates to a wiper for a window having a constant radius of curvature. In this wiper comprising an arm (2, 3) equipped with a blade, and means for pushing the wiper blade against the window, the axis (6) of the wiper is oriented towards the along a radial line with respect to the center of curvature of the window, the arm (2, 3) and a bearing element (5, 8) mounted in such a way as to be rotatable in the bearing of the wiper are connected between them to form a rigid construction unit, and the arm (2, 3) is movable elastically, axially, essentially parallel to the radial line. Application in particular to windshield wipers of motor vehicles.

Description

The invention relates to a wiper for a window having a radius of

  constant curvature, in particular for a window formed of a sphere segment, of a motor vehicle, comprising a windscreen wiper arm pivotable about an axis of a wiper bearing and to which is associated a wiper blade, and means for pushing the wiper blade back

against the glass.

  According to the published German patent application DE-OS 23 64 622, there is known a wiper, the wiper arm has a support, which carries the wiper blade, and an arm spring, which holds the support of the broom and which can be connected to a part

  forming a hub which can be connected to the wiper support shaft.

  ice cream. The spring arm applies the preload necessary to push back the wiper blade support and the wiper blade

against the glass.

  The invention aims to achieve a wiper of the type indicated above, which can be manufactured simply and cheaply.

  This problem is solved thanks to the fact that the axis of the wiper

  ice is oriented along a straight line radial to the center of curvature of the window pane, that the wiper arm and a bearing element mounted rotatably in the wiper bearing are connected between they form a rigid construction unit and that the wiper arm is axially displaceable elastically, substantially parallel to the radial line. Thanks to the connection between the wiper bearing element and the wiper arm to form a rigid construction unit, a wiper is obtained that is much simpler than conventional windshield wipers since the known wipers require, for the connection of the wiper arm

  at the wiper bearing, several hinge and spring elements.

  The windscreen wiper according to the invention can therefore be manufactured in a manner which is considerably cheaper than

known wipers.

  According to a development of the invention, the wiper arm

  ice is made in one piece and the wiper arm material is weakened so as to be elastically flexible in a portion connecting to the axis of the wiper. This weakened part replaces the joint present in wipers known for obtaining

  a sufficient pressure of clamping the wiper arm on the window.

  According to another embodiment of the invention, the bearing element of the wiper is retained so as to be displaceable, being loaded axially by a spring, in the bearing of the wiper. Since the wiper arm and the wiper bearing element form a rigid building unit, the clamping pressure of the wiper arm is obtained in a simple manner by means of a constraint. axial spring of the element of

bearing of the wiper.

  According to another development of the invention, the wiper arm and the wiper bearing element are made in the form of a common one-piece component. This leads to a

  further simplification of the windscreen wiper.

  According to another development of the invention, the wiper blade is connected in one piece to the wiper arm. As a result, further simplification and reduction is achieved.

  additional cost of the wiper.

  According to another development of the invention, the wiper is mounted on a pivotable platen, which is loaded by a spring acting in the direction of the window. As a result, the entire wiper device can pivot in a simple manner, being subject to

  to the action of a spring, around an axis of rotation.

  According to another development of the invention, the wiper arm is connected to a control cam in an active connection, by means of which it can be discharged axially during

  from its wiping motion, in its cusp positions.

  This allows a simple replacement of the squeegee of the wiper blade.

ice cream.

  Other features and benefits of this

  invention will emerge from the description given below, taken in

  1 shows, in a side elevational view, an embodiment of a wiper according to the invention, the arm is provided with a weakened part which is connected directly at the axis of the windscreen wiper; FIG. 2 represents a plan view of another embodiment of a windscreen wiper according to the invention, whose arm has a portion weakened by holes and which is connected to the axis of the wiper. ice cream; Figure 3 shows a section of the windscreen wiper of Figure 1 taken along the line HI-HI in Figure 1; FIG. 4 shows the trunnion system of another embodiment of a windscreen wiper according to the invention, at the axis of the windscreen wiper; 5 schematically shows another embodiment of a wiper according to the invention, which is mounted, together with the other parts of the wiper system, on a plate pivotable about a fixed axis rotation; FIG. 6 schematically represents another embodiment of a windscreen wiper according to the invention, which is arranged in the form of a one-piece component, the windscreen wiper being connected directly and over its entire length. on the wiper arm; Figure 7 shows another embodiment similar to that of Figure 4, in which the axial displacement of the wiper arm is controlled by a control cam; Figure 8 schematically shows a plan view of the wiper displacement of the wiper arm of Figure 7; and * Figure 9 shows the slide guide, used as a control cam, according to Figures 7 and 8, in full size. A wiper 1 according to Figure 1 has an arm 2, 3, which is made of a steel sheet for springs. At its free end, the arm 2, 3 of the wiper may be a hook-shaped stirrup 4, to which the support of the wiper blade can be fixed. The arm of the windscreen wiper is inserted at its end opposite the hook-shaped stirrup 4 into a groove 7 of a bearing element 5 of the windscreen wiper and is fixed rigidly in the latter by means of a grub screw 9. The wiper arm 2, 3 protrudes transversely from the bearing element 5 of the windscreen wiper and consequently radially with respect to the axis 6 of the wiper since the bearing element 5 has, as an extension, a trunnion shaft 8 coaxial with the axis 6 of the wiper and which is retained by a not shown in a corresponding sleeve of a wiper bearing, so as to be rotatable, and can be rotated back and forth by means of a driving device. The wiper arm 2, 3 has, in a portion connecting to the axis 6 of the windscreen wiper and therefore to the bearing element 5 of the windscreen wiper, corrugations 3, by means of which the wiper arm 2, 3 is more unstable in this part than on the rest of its length. The wiper arm 2, 3 is therefore not rigid in this part, but it is elastically flexible. This part 3 plays the role of a joint. The wiper arm 2, 3 can therefore bend away from the window

  in the area of the corrugations 3 as soon as a wiper support

  ice cream, provided with such a broom, is mounted on the stirrup shaped

hook 4.

  The same function is assumed, in the case of the wiper of Figure 2 not by undulations, but by a perforated portion 3a of the wiper arm 2a, 3a. Several holes 10 formed by cutting are provided in part 3a. Due to the weakening of the material, that is to say of the steel sheet for springs in this area, one obtains an increased flexibility which, in the same way as in the case of the exemplary embodiment of Figure 1 assumes the role of a hinge for the wiper arm 2a, 3a. The wiper arm 2a, 3a is rigidly fixed in a bearing element 5a of the windscreen wiper,

  the same way as in the case of the wiper 1 of Figures 1 and 3.

  A windshield wiper according to FIG. 3 has an arm 11, which extends in one piece, in the form of a hub, by a bearing element 12 of the windshield wiper, the hub extension 16 being used as support shaft of the bearing element. The hub extension 16 can rotate, coaxially with the axis 6 of the wiper, in a fixed sleeve 13 of the wiper bearing. The arm 11 of the windscreen wiper and consequently also the hub-shaped extension 16 are supported so as to be axially displaceable with respect to the axis 6 of the windscreen wiper, in the bushing of the bearing 13 of the windscreen wiper. 'wiper. The hub-shaped extension 16 may be loaded by a spring in the axial direction, thereby obtaining axial flexibility of the arm 11 of the windscreen wiper. For this purpose, a helical spring 14, arranged in the form of a pressure spring, is supported on the one hand against a lower front edge of the fixed sleeve 13 of the wiper bearing and on the other hand against a fixing ring 15 fixed axially to the hub-forming extension 16. This is why it is possible to have an axial mobility of the arm 11 of the broom

  windscreen wiper against the force of the coil spring 14.

  All wipers described are intended for wiping a window having a constant radius of curvature, in which case there is provided either a window arranged in the form of a sphere segment or a window having a radius of curvature infinite, that is to say a flat glass. The axes 6 of the wipers respectively form a radial line with respect to the center of curvature of the window, in which case, in the case of a flat flat window, the axis of the wiper is perpendicular to this window. . Since the radius of curvature of the glass does not vary, it is possible to arrange the windscreen wiper

simple, as described here.

  Similarly, in the case of the embodiment of the Figure, there is provided a windscreen wiper 17 for wiping a window 25 in the form of a sphere segment of a motor vehicle. The windscreen wiper 17 is arranged in accordance with the windscreen wiper of FIG. 4 and is retained, including its bearing 18, on a plate 26, which is mounted so as to be pivotable about a pivot axis 21 secured to the vehicle, so as to move towards and away from the window 25. In addition, on the plate 26 is provided a drive motor of the wiper arm, which serves to drive the wiper. 17, as well as a fixing and adjusting screw 19 for adjusting the clamping pressure of the wiper arm relative to the window 25. With the aid of this fixing and adjusting screw 19, simply adjust the force of the axial spring at the level 18 of the wiper (in a similar manner to Figure 4). In addition, the fixing and adjusting screw 19 serves to fix the bearing

wiper on the plate 26.

  The wiper of Figure 6 represents a particularly simple embodiment since it is

  simple one-piece component, preferably plastic.

  The bearing element 24 of the windscreen wiper and the arm 22 of the windscreen wiper are made in one piece. The wiping profile 23 of rubber used as wiper blade is connected directly, along its entire length, to the arm 22 of the wiper. The wiper can pivot about its axis 6, which is a line radial to the center of curvature of the pane not shown, which must be wiped. The plate 26 is loaded by a spring around the axis of rotation so as to apply the necessary clamping pressure to the entire system

  wiper and therefore also on the arm 17 of the wiper.

ice compared to glass 25.

  To reduce the clamping pressure of a wiper arm 11 which corresponds to Figure 4, in its two cusp positions, and thus allow a simplified replacement of the squeegee of the wiper blade, the wiper FIGS. 7 to 9 are additionally equipped with a control cam 18 which moves the arm 11 of the windscreen wiper in an axial direction. As can be seen in FIG. 9, the control cam arranged in the form of a sliding guide 18 rises obliquely towards its two end points - i.e. at the cusp positions of the arm 11 of the wiper. A rigid lever-forming extension 17 projects laterally from the bearing element 12, 16 of the arm 11 of the windscreen wiper and bears, at a point 20, on a guide ball 19, which circulates in the guide. slide 18. Slide guide 18 is fixedly mounted around the wiper bearing and concentrically around axis 6 of the wiper. It is bent according to an arc that extends at an angle that corresponds to the maximum angle

  pivoting arm 11 of the wiper, which moves in and out

comes.

Claims (6)

  1. Windscreen wiper for a window having a constant radius of curvature, in particular for a window formed of a sphere segment, of a motor vehicle, comprising a windscreen wiper arm pivotable about an axis of a bearing of the wiper and which is associated with a wiper blade, and means for pushing the wiper blade against the window, characterized in that the axis (6) of the wiper blade ice is oriented along a straight line radial to the center of curvature of the window (25), that the wiper arm (2,3; 2a, 3a; 11, 22) and a bearing element ( 5,8,12,16) rotatably mounted in the wiper bearing (13,18) are interconnected to form a rigid building unit and the wiper arm (2, 3; 2a, 3a; 22) is axially displaceable elastically,   essentially parallel to the radial line.   Windscreen wiper according to Claim 1, characterized in that the wiper arm (1, 2) is made in one piece and that the wiper arm material is weakened so as to be flexible   elastically in a portion connecting to the axis (6) of the wiper.   Windscreen wiper according to Claim 1, characterized in that the bearing element (12, 16) of the windscreen wiper is displaceably retained by being axially loaded by a spring in the bearing ( 13) the wiper.   Windscreen wiper according to one of Claims 1 to   3, characterized in that the wiper arm (22) and the bearing element (24) of the windscreen wiper are in the form of a component common piece.   Windshield wiper according to one of Claims 1 to   4, characterized in that the windscreen wiper (17) is mounted on a pivotable platen (26), which is loaded by   a spring acting in the direction of the window (25).   Windscreen wiper according to one of Claims 1 to   , characterized in that the wiper arm (5) is connected to a control cam (18) in an active connection, by means of which it can be discharged axially during its wiping motion, in his curbing positions.